After suffering multiple concussions in a series of wrecks—the most recent after this massive scramble at Talladega on Sunday—Dale Earnhardt, Jr. will miss the next two NASCAR Chase races following discussions with medical experts.

The one in Kansas was really bad, and to get shaken up so quickly over something so trivial...I've been through tons of last-lap wrecks at Daytona and that one shook me up, and I thought maybe I should take this seriously.

Earnhardt's neurosurgeon explained the process by which the driver was tested and how he might get the green light to drive again:

We did an MRI the following morning [...] that was normal, and very encouraging. He had no amnesia on either side of the incidents, which is very important. What we'll do now is, we'd like him to have four or five days during which he has no headache, give him a test to get his pulse rate up to see if we can provoke a headache, then send him out to drive a lap or two and see how that goes.

Earnhardt will miss the Charlotte and Kansas races, ending his streak of 461 straight races that started in 1999. In the aftermath of this past weekend's wreck, he claimed he didn't want to drive at Talladega or Daytona anymore, calling it "bloodthirsty."